Calculations of the free-bound/radiative recombination continuum and radiation losses depend on a file that provides and LS description of the bound and singly excited energy levels. This file is called c_5.fblvl in the case of C V. Not all ions have an associated .fblvl files and is was necessary to revise ChiantiPy to ignore the free-bound calculation for these ions.
In addition, it was found that under extreme conditions, such as very low temperatures for highly ionized species, that bad values would arise (Nans and infinities). These are now detected and removed.